The event is a gathering sponsored by several socially-conservative Christian organizations, including the Family Research Council, a socially conservative lobbying organization; Liberty University, the world's largest evangelical university; and the National Organization for Marriage, a group established to prevent the legalization of same-sex marriage.

Trump, who told CNN earlier that he is both anti-abortion and anti-same-sex marriage, said people are surprised to learn about his Christian faith.

"People are so shocked when they find ... out I am Protestant. I am Presbyterian. And I go to church and I love God and I love my church," he said.

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Moderator Frank Luntz asked Trump whether he has ever asked God for forgiveness for his actions.

"I am not sure I have. I just go on and try to do a better job from there. I don't think so," he said. "I think if I do something wrong, I think, I just try and make it right. I don't bring God into that picture. I don't."

Trump said that while he hasn't asked God for forgiveness, he does participate in Holy Communion.

"When I drink my little wine -- which is about the only wine I drink -- and have my little cracker, I guess that is a form of asking for forgiveness, and I do that as often as possible because I feel cleansed," he said. "I think in terms of 'let's go on and let's make it right.'"